CN116624857A - Economizer and waste heat recovery boiler with same - Google Patents

Economizer and waste heat recovery boiler with same Download PDF

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Publication number
CN116624857A
CN116624857A CN202310725560.2A CN202310725560A CN116624857A CN 116624857 A CN116624857 A CN 116624857A CN 202310725560 A CN202310725560 A CN 202310725560A CN 116624857 A CN116624857 A CN 116624857A
Authority
CN
China
Prior art keywords
heat exchange
calandria
pipe
economizer
water inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310725560.2A
Other languages
Chinese (zh)
Inventor
赵文涛
黄岳军
李俊
赵虎
谭梦磊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangyin Denaite Heavy Industry Science & Technology Co ltd
Original Assignee
Jiangyin Denaite Heavy Industry Science & Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangyin Denaite Heavy Industry Science & Technology Co ltd filed Critical Jiangyin Denaite Heavy Industry Science & Technology Co ltd
Priority to CN202310725560.2A priority Critical patent/CN116624857A/en
Publication of CN116624857A publication Critical patent/CN116624857A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1892—Systems therefor not provided for in F22B1/1807 - F22B1/1861
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Abstract

The invention discloses an economizer and a waste heat recovery boiler with the same, comprising a frame plate, a plurality of calandria, a supporting piece and a plurality of heat recovery boilers, wherein the calandria is fixedly connected with the frame plate, the supporting piece is used for supporting the calandria, the supporting piece is arranged between the two frame plates, and the calandria is connected with the supporting piece; the support piece is a heat exchange tube. The economizer and the waste heat recovery boiler with the same are reasonable in structure, and can support the calandria between the frame plates and improve the heat exchange efficiency of the economizer.

Description

Economizer and waste heat recovery boiler with same
Technical Field
The invention relates to a supporting component, in particular to an economizer and a waste heat recovery boiler with the same.
Background
The waste heat recovery boiler is a boiler utilizing waste heat of high-temperature flue gas, is generally arranged vertically and can be divided into a plurality of circulation loops, each circulation loop consists of a descending pipe and an ascending pipe, feed water enters the boiler barrel through the economizer, is introduced into each lower header of the flue from the boiler barrel through the descending pipe and then enters each heating surface, and steam generated after passing through the heating surfaces enters the header and then enters the boiler barrel.
The economizer is an essential main component part of a waste heat recovery boiler, the structure of the economizer in the prior art is as described in CN204693369U, the economizer comprises a first header, a low-temperature economizer water inlet, a second header, a low-temperature economizer water outlet, a heating surface tube bank and an anti-abrasion structure, the first header is connected with the low-temperature economizer water inlet, the low-temperature economizer water inlet is connected with one end of the heating surface tube bank, the other end of the heating surface tube bank is connected with the second header, the second header is connected with the low-temperature economizer water outlet, the anti-abrasion structure is coated on the heating surface tube bank, the heating surface tube bank comprises a plurality of tube sections, a plurality of connecting structures and a plurality of connecting elbows, the tube sections are connected with the connecting elbows through the connecting structures, and the anti-abrasion structure is coated on a plurality of connecting elbows.
The tube bank is fixed through first header and second header, because the tube bank overlength is located the tube bank between first header and the second header and does not have the support, can take place deformation phenomenon under gravity effect and high temperature flue gas impact, smoke and dust stack, fragile tube bank self structure in the past, connection structure between tube bank and first header and the second header, influence economizer's life.
Therefore, there is a need for improvements in the prior art economizer and waste heat recovery boiler having the same.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides an economizer and a waste heat recovery boiler with the same, which can support a calandria between frame plates and improve the heat exchange efficiency of the economizer.
In order to achieve the technical effects, the technical scheme of the invention is as follows: the economizer comprises a frame plate, a plurality of calandria, a supporting piece and a plurality of supporting pieces, wherein the calandria is fixedly connected with the frame plate, the supporting piece is used for supporting the calandria, the supporting piece is arranged between the two frame plates, and the calandria is connected with the supporting piece; the support piece is a heat exchange tube.
The preferable technical scheme is that the heat exchange tube is provided with a lifting structure for improving heat exchange efficiency.
The preferable technical scheme is that the lifting structure comprises a spiral section, and the heat exchange tube is provided with the spiral section.
The preferable technical scheme is that two adjacent spiral units of the spiral section are fixedly connected.
The preferable technical scheme is that the heat exchange tube is provided with a reinforcing rib for improving the strength of the spiral section, and the reinforcing rib is fixedly arranged between two adjacent spiral units of the spiral section.
The preferable technical scheme is that the heat exchange tube further comprises a heat exchange fin connected with the calandria, and the heat exchange fin is fixedly arranged on the reinforcing rib; the heat exchange fin is provided with a limiting groove which is in limiting fit with the calandria.
The preferable technical scheme is that the heat exchange tube and the outer wall of the calandria are fixedly provided with a thickening plate.
The preferable technical proposal is that the utility model also comprises a water inlet pipe communicated with the water inlet of the calandria and a water outlet pipe communicated with the water outlet of the calandria; the water inlet pipe is provided with a water inlet branch pipe, and the water inlet of the heat exchange pipe is communicated with the water inlet branch pipe; the water outlet pipe is provided with a water outlet branch pipe, and the water outlet of the heat exchange pipe is communicated with the water outlet branch pipe.
The preferable technical scheme is that the frame plate is fixedly provided with a fixing plate for fixing the water inlet branch pipe and the water outlet branch pipe.
A waste heat recovery boiler comprising any of the above-described economizers.
The invention has the advantages and beneficial effects that: the economizer and the waste heat recovery boiler with the same are reasonable in structure, and the heat exchange pipes are arranged on the calandria between the frame plates, so that the calandria is supported, heat exchange can be performed with the calandria, and heat exchange can be performed with high-temperature flue gas at the same time, and the heat exchange efficiency of the economizer is improved.
Drawings
FIG. 1 is a schematic view of an embodiment 1 of an economizer of the present invention and a heat recovery boiler having the same;
FIG. 2 is a schematic view of a portion of the explosion of FIG. 1;
FIG. 3 is a schematic view showing the structure of the heat exchange tube of example 1 connected to a drain pipe;
fig. 4 is a schematic structural view of a heat exchange tube of embodiment 1;
fig. 5 is a schematic structural view of embodiment 2;
FIG. 6 is a schematic view showing the structure of the heat exchange tube of example 2 connected to a drain pipe;
FIG. 7 is an exploded view of the heat exchange tube and the welded tube of example 2;
FIG. 8 is a plan view of a heat exchange tube of embodiment 2;
FIG. 9 is a schematic view of the structure of a welded pipe according to example 2;
fig. 10 is a schematic structural view of a heat exchange tube of embodiment 3;
FIG. 11 is an exploded view of FIG. 10;
fig. 12 is an exploded view of the heat exchange tube of example 4;
in the figure: 1. a frame plate; 11. a fixing plate; 2. a calandria; 3. a heat exchange tube; 31. welding the pipe; 311. a convex column; 312. an annular wall; 313. perforating; 32. a communicating pipe; 4. a helical section; 5. reinforcing ribs; 6. a heat exchange fin; 61. a limit groove; 7. increasing the thickness plate; 8. a water inlet pipe; 81. a water inlet branch pipe; 9. a water outlet pipe; 91. and a water outlet branch pipe.
Detailed Description
The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "horizontal," "vertical," "top," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
As shown in fig. 1 to 4, the economizer of embodiment 1 comprises a frame plate 1 and a plurality of gauntlets 2, wherein the gauntlets 2 are fixedly connected with the frame plate 1, and further comprises a supporting piece for supporting the gauntlets 2, the supporting piece is arranged between the two frame plates 1, and the gauntlets 2 are connected with the supporting piece; the support is a heat exchange tube 3.
The two ends of the calandria 2 are respectively fixed with the frame plates 1, and as the calandria 2 is overlong, if the calandria 2 between the two frame plates 1 is unsupported, deformation is easy to occur under the action of gravity or smoke impact, and structural damage of the calandria is caused for a long time; through the design of above-mentioned scheme, heat exchange tube 3 not only can play the supporting role to calandria 2 between two frame boards 1, can also further play the heat transfer effect, and heat exchange tube 3 carries out the heat transfer with calandria 2 and outside high temperature flue gas simultaneously, improves the heat absorption efficiency of high temperature flue gas.
Further, the heat exchange tube 3 is an in-line water-cooled heat exchange tube, the in-line water-cooled heat exchange tube is fixedly provided with a heat exchange fin 6 connected with the calandria 2, and the heat exchange fin 6 is provided with a limit groove 61 in limit fit with the calandria 2.
Through such design, calandria 2 is spacing in heat transfer fin 6, has realized calandria 2 and heat exchange tube 3 fixed connection's purpose, and heat exchange tube 3 plays the supporting role and reaches the heat transfer purpose to calandria 2.
Specifically, the heat exchange tube 3 is provided with a welded tube 31 for welding with a support beam of the smoke box, and the extending direction of the welded tube 31 is consistent with the direction from the bottom of the limit groove 61 to the notch.
Through the design, the purpose of hoisting and installing the economizer is achieved.
The device comprises a calandria 2, a calandria water inlet pipe 8 and a water outlet pipe 9, wherein the calandria 2 is provided with a water inlet; the water inlet pipe 8 is provided with a water inlet branch pipe 81, and the water inlet of the heat exchange pipe 3 is communicated with the water inlet branch pipe 81; the water outlet pipe 9 is provided with a water outlet branch pipe 91, and the water outlet of the heat exchange pipe 3 is communicated with the water outlet branch pipe 91.
Through such design, realized calandria 2 and heat exchange tube 3 water-through purpose, cold water is gone into hot water and is gone out, absorbs the heat of flue gas.
Further, the frame plate 1 is fixedly provided with a fixing plate 11 for fixing the water inlet branch pipe 81 and the water outlet branch pipe 91.
By such a design, the purpose of fixing the water inlet branch pipe 81 and the water outlet branch pipe 91 is achieved.
Further, the heat exchange fins 6 are arranged in one-to-one correspondence with the gauntlets 2.
Through such design, all calandria 2 can all obtain effectual support, strengthens the heat exchange efficiency of calandria 2 and heat exchange tube 3 through increasing area of contact simultaneously.
Further, the heat exchange tube 3 is provided with a plurality of groups along the axial direction of the calandria 2.
By such a design, the supporting effect on the gauntlet tube 2 is further enhanced and the heat exchange efficiency is improved.
A waste heat recovery boiler comprises the economizer.
The mode of use of example 1 is: the high-temperature flue gas is led into a waste heat recovery boiler and passes through an economizer; cooling water enters the calandria 2 and the heat exchange tube 3 from the water inlet tube 8, the calandria 2 and the heat exchange tube 3 exchange heat with high-temperature flue gas, the cooling water absorbs heat and heats up, and hot water is discharged from the water outlet tube 9 for use, so that the purpose of utilizing the waste heat of the high-temperature flue gas is realized.
Example 2
As shown in fig. 5 to 9, embodiment 2 is based on embodiment 1, except that: the heat exchange tube 3 is provided with a lifting structure for improving heat exchange efficiency thereof.
Through the design, the aim of improving the heat exchange efficiency of the heat exchange tube 3 can be achieved by increasing the surface area of the heat exchange tube 3 and prolonging the flowing time of circulating water in the heat exchange tube 3.
In particular, the lifting structure comprises a helical section 4, the heat exchange tube 3 being provided with the helical section 4.
By means of the design, the surface area of the heat exchange tube 3 is greatly increased by the spiral section 4 (not only the outer ring surface can exchange heat with high-temperature flue gas, but also the inner ring surface can exchange heat with the high-temperature flue gas), and the high-temperature flue gas and the heat exchange tube 3 have a large enough contact area, so that the heat exchange efficiency of the heat exchange tube 3 is enhanced; the spiral section 4 also increases the circulation distance of the circulating water, so that the circulation time of the circulating water in the heat exchange tube 3 is increased, and the heat exchange efficiency of the heat exchange tube 3 is further enhanced.
Further, two adjacent spiral units of the spiral section 4 are fixedly connected.
Through the design, the strength of the spiral section 4 is ensured, and two adjacent spiral units can be tightly attached and then welded and fixed, and filling pieces can be welded in the gaps of the two adjacent spiral units.
Further, the heat exchange tube 3 is provided with a reinforcing rib 5 for improving the strength of the spiral section 4, and the reinforcing rib 5 is fixedly arranged between two adjacent spiral units of the spiral section 4.
Through such design, the strength of the spiral section 4 is ensured, and the spiral section 4 is prevented from deforming under the impact of smoke and the accumulation of smoke dust.
Specifically, the heat exchange tube further comprises a heat exchange fin 6 connected with the calandria 2, and the heat exchange fin 6 is fixedly arranged on the reinforcing rib 5.
Through such design, heat transfer fin 6 and the contact of strengthening rib 5, strengthening rib 5 and spiral section 4 contact, compare in heat transfer fin 6 direct fixation in the surface of spiral section 4, increased heat transfer fin 6 and the area of contact of spiral section 4, improved the heat transfer effect of heat transfer fin 6.
Specifically, the welding pipe 31 is provided with a convex column 311 fixedly connected with the inner ring of the spiral section 4, the welding pipe 31 is provided with an annular wall 312 fixedly connected with the outer ring of the spiral section 4, and the end part of the spiral section 4 is clamped and fixed between the annular wall 312 and the convex column 311.
Through such design, the convex column 311 and the annular wall 312 of the welding pipe 31 can be welded and fixed with the inner and outer circles of the spiral section 4, so that the firmness of the welding pipe 31 and the spiral section 4 is ensured.
Specifically, the water inlets of two adjacent spiral segments 4 are communicated through the communicating pipe 32, and the annular wall 312 is provided with a through hole 313 through which the communicating pipe 32 passes.
Through the design, the purpose that two adjacent spiral sections 4 are communicated is achieved, namely, water passing of the spiral sections 4 is guaranteed, and hoisting of the spiral sections 4 is not affected.
Example 3
As shown in fig. 10 to 11, embodiment 3 is based on embodiment 2, except that: the heat exchange tube 3 comprises a plurality of identical spiral sections 4, the central lines of the spiral sections 4 are overlapped, and spiral units of two adjacent spiral sections 4 are attached to each other.
For the single helical segment 4, the circulation time of the circulating water is reduced compared to example 2, although the pitch is increased, and the circulation time of the circulating water is still longer than that of the straight tube of example 1; by the design, the phenomenon that the temperature of the circulating water in the spiral section 4 is too high due to the fact that the circulating water flows in the spiral section 4 for too long time can be avoided, and the heat exchange effect is reduced; the flow pipeline is increased by vertically stacking the spiral sections 4, so that the flow of the flowing water is increased, and the heat exchange effect is further improved.
Example 4
As shown in fig. 12, embodiment 3 is based on embodiment 1, with the difference that: the outer wall of the heat exchange tube 3 and the calandria 2 is fixedly provided with a thickening plate 7.
Through such design, avoid the striking of flue gas to heat exchange tube 3, calandria 2 to lead to the wearing and tearing of heat exchange tube 3, calandria 2, the life of heat exchange tube 3 and calandria 2 can be prolonged to the thickening board 7.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that it will be apparent to those skilled in the art that several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the scope of the invention.

Claims (10)

1. The coal economizer comprises a frame plate (1) and a plurality of calandria (2), wherein the calandria (2) is fixedly connected with the frame plate (1), and is characterized by further comprising a supporting piece for supporting the calandria (2), the supporting piece is arranged between the two frame plates (1), and the calandria (2) is connected with the supporting piece; the support piece is a heat exchange tube (3).
2. The economizer according to claim 1, characterized in that the heat exchange tube (3) is provided with a lifting structure for improving its heat exchange efficiency.
3. The economizer according to claim 2, characterized in that the lifting structure comprises a spiral section (4), the heat exchange tube (3) being provided with the spiral section (4).
4. A coal economizer according to claim 3, characterized in that adjacent two spiral units of the spiral section (4) are fixedly connected.
5. The economizer according to claim 4, characterized in that the heat exchange tube (3) is provided with a reinforcing rib (5) for improving the strength of the spiral section (4), the reinforcing rib (5) being fixedly arranged between two adjacent spiral units of the spiral section (4).
6. The economizer according to claim 5, further comprising heat exchange fins (6) for connection to the gauntlet (2), the heat exchange fins (6) being fixedly arranged on the stiffener (5); the heat exchange fin (6) is provided with a limiting groove (61) which is in limiting fit with the calandria (2).
7. The economizer according to claim 1, characterized in that the heat exchange tubes (3) and the outer walls of the gauntlets (2) are fixedly provided with thickening plates (7).
8. The economizer according to claim 1, further comprising a water inlet pipe (8) communicating with the water inlet of the gauntlet (2) and a water outlet pipe (9) communicating with the water outlet of the gauntlet (2); the water inlet pipe (8) is provided with a water inlet branch pipe (81), and a water inlet of the heat exchange pipe (3) is communicated with the water inlet branch pipe (81); the water outlet pipe (9) is provided with a water outlet branch pipe (91), and the water outlet of the heat exchange pipe (3) is communicated with the water outlet branch pipe (91).
9. The economizer according to claim 8, characterized in that the frame plate (1) is fixedly provided with a fixing plate (11) for fixing the water inlet branch pipe (81) and the water outlet branch pipe (91).
10. A waste heat recovery boiler comprising an economizer according to any one of claims 1-9.
CN202310725560.2A 2023-06-19 2023-06-19 Economizer and waste heat recovery boiler with same Pending CN116624857A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310725560.2A CN116624857A (en) 2023-06-19 2023-06-19 Economizer and waste heat recovery boiler with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310725560.2A CN116624857A (en) 2023-06-19 2023-06-19 Economizer and waste heat recovery boiler with same

Publications (1)

Publication Number Publication Date
CN116624857A true CN116624857A (en) 2023-08-22

Family

ID=87592120

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310725560.2A Pending CN116624857A (en) 2023-06-19 2023-06-19 Economizer and waste heat recovery boiler with same

Country Status (1)

Country Link
CN (1) CN116624857A (en)

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